Merge branch 'master' of git://git.denx.de/u-boot

[platform/kernel/u-boot.git] / arch / arm / cpu / armv7 / lowlevel_init.S

diff --git a/arch/arm/cpu/armv7/lowlevel_init.S b/arch/arm/cpu/armv7/lowlevel_init.S
index 82b2b86..1872c57 100644 (file)
--- a/arch/arm/cpu/armv7/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/lowlevel_init.S
@@ -17,16 +17,24 @@
 
 ENTRY(lowlevel_init)
        /*
-        * Setup a temporary stack
+        * Setup a temporary stack. Global data is not available yet.
         */
        ldr     sp, =CONFIG_SYS_INIT_SP_ADDR
        bic     sp, sp, #7 /* 8-byte alignment for ABI compliance */
+#ifdef CONFIG_SPL_DM
+       mov     r9, #0
+#else
+       /*
+        * Set up global data for boards that still need it. This will be
+        * removed soon.
+        */
 #ifdef CONFIG_SPL_BUILD
-       ldr     r8, =gdata
+       ldr     r9, =gdata
 #else
-       sub     sp, #GD_SIZE
+       sub     sp, sp, #GD_SIZE
        bic     sp, sp, #7
-       mov     r8, sp
+       mov     r9, sp
+#endif
 #endif
        /*
         * Save the old lr(passed in ip) and the current lr to stack
@@ -34,7 +42,17 @@ ENTRY(lowlevel_init)
        push    {ip, lr}
 
        /*
-        * go setup pll, mux, memory
+        * Call the very early init function. This should do only the
+        * absolute bare minimum to get started. It should not:
+        *
+        * - set up DRAM
+        * - use global_data
+        * - clear BSS
+        * - try to start a console
+        *
+        * For boards with SPL this should be empty since SPL can do all of
+        * this init in the SPL board_init_f() function which is called
+        * immediately after this.
         */
        bl      s_init
        pop     {ip, pc}